﻿using System;
using System.Collections.Generic;
using System.IO.Ports;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using ZwxCommunication;

namespace Communication.Gree
{
    public class GreeAgv
    {
        public Action<int, List<byte>> ResponseData;
        private static GreeAgv _instance;
        private static SerialInfo _serialInfo;

        SerialPort _serialPort;
        bool _isBusing = false;

        public GreeAgv(SerialInfo serialInfo)
        {
            _serialPort = new SerialPort();
            _serialInfo = serialInfo;
        }

        public static GreeAgv GetInstance(SerialInfo serialInfo)
        {
            lock ("lock")
            {
                if (_instance == null) new GreeAgv(serialInfo);
                return _instance;
            }
        }

        public bool Connection()
        {
            try
            {
                if (_serialPort.IsOpen) _serialPort.Close();
                _serialPort.PortName = _serialInfo.PortName;
                _serialPort.BaudRate = _serialInfo.BaudRate;
                _serialPort.DataBits = _serialInfo.DataBit;
                _serialPort.Parity = _serialInfo.Parity;
                _serialPort.StopBits = _serialInfo.StopBits;

                _serialPort.ReceivedBytesThreshold = 1;
                _serialPort.DataReceived += _serialPort_DataReceived;

                _serialPort.Open();
            }
            catch 
            {
                return false;
            }
            return true;
        }

        public void Dispose()
        {
            if (_serialPort.IsOpen)
            {
                _serialPort.Close();
                _serialPort.Dispose();
                _serialPort = null;
            }
        }

        int _receiveByteCount = 0;
        byte[] _byteBuffer = new byte[1024];

        private void _serialPort_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            byte _receiveBytes;
            while (_serialPort.BytesToRead > 0)
            {
                _receiveBytes = (byte)_serialPort.ReadByte();
                _byteBuffer[_receiveByteCount] = _receiveBytes;
                _receiveByteCount++;
                if (_receiveByteCount >= _byteBuffer.Length)
                {
                    //超过设置长度则丢弃缓存数据
                    _receiveByteCount = 0;
                    _serialPort.DiscardInBuffer();
                    return;
                }
            }
            if (_byteBuffer[1] == 0xA9 && (_byteBuffer[2] == 0xB1|| _byteBuffer[2] == 0xB2))
            {
                if (_byteBuffer[_byteBuffer.Length-2] == CalculateSum(_byteBuffer.Take(_byteBuffer.Length - 2).ToArray()))
                {//校验通过

                    // 返回数据
                    ResponseData?.Invoke(_byteBuffer[0], new List<byte>(SubByteArray(_byteBuffer, 3, 7)));
                    _serialPort.DiscardInBuffer();
                }               
            }
        }

        public async Task<bool> Send(byte funCode, byte[] datas)
        {
            if (datas.Length != 7) return false;
            byte[] sendCheckBuffer = new byte[9];
            //List<byte> sendBuffer = new List<byte>();
            //sendBuffer.Add((byte)slaveAddr);
            //sendBuffer.Add(funcCode);
            //sendBuffer.Add((byte)(startAddr / 256));
            //sendBuffer.Add((byte)(startAddr % 256));
            //sendBuffer.Add((byte)(len / 256));
            //sendBuffer.Add((byte)(len % 256));
            //byte[] crc = Crc16(sendBuffer.ToArray(), 6);
            //sendBuffer.AddRange(crc);

            byte[] sendBuffer = new byte[11];
            sendBuffer[0] = 0xA9;
            sendBuffer[1] = funCode;
            Array.Copy(datas, 0, sendBuffer, 2, 7);
            Array.Copy(sendBuffer, sendCheckBuffer, 9);//复制之前的数组
            sendBuffer[9] = CalculateSum(sendCheckBuffer);
            sendBuffer[10] = 0x05;

            try
            {
                while (_isBusing)
                {
                    _isBusing = true;
                    _serialPort.Write(sendBuffer.ToArray(), 0, 8);
                    _isBusing = false;

                    await Task.Delay(1000);
                }
            }
            catch
            {
                return false;
            }
            _receiveByteCount = 0;
            return true;
        }

        private byte[] SubByteArray(byte[] byteArr, int start, int len)
        {
            byte[] Res = new byte[len];
            if (byteArr != null && byteArr.Length > start + len)
            {
                Res = byteArr.Skip(start).Take(len).ToArray();
            }
            return Res;
        }

        //private List<byte> buffer = new List<byte>(4096);
        //private void sp_DataReceived(object sender, EventArgs e) //sp是串口控件
        //{
        //    int n = _serialPort.BytesToRead;
        //    byte[] buf = new byte[n];
        //    _serialPort.Read(buf, 0, n);

        //    //1.缓存数据
        //    buffer.AddRange(buf);
        //    //2.完整性判断
        //    while (buffer.Count >= 4) //至少包含帧头（2字节）、长度（1字节）、校验位（1字节）；根据设计不同而不同
        //    {
        //        //2.1 查找数据头
        //        if (buffer[0] == 0x01) //传输数据有帧头，用于判断
        //        {
        //            int len = buffer[2];
        //            if (buffer.Count < len + 4) //数据区尚未接收完整
        //            {
        //                break;
        //            }
        //            //得到完整的数据，复制到ReceiveBytes中进行校验
        //            buffer.CopyTo(0, ReceiveBytes, 0, len + 4);
        //            byte jiaoyan; //开始校验
        //            jiaoyan = this.JY(ReceiveBytes);
        //            if (jiaoyan != ReceiveBytes[len + 3]) //校验失败，最后一个字节是校验位
        //            {
        //                buffer.RemoveRange(0, len + 4);
        //                MessageBox.Show("数据包不正确！");
        //                continue;
        //            }
        //            buffer.RemoveRange(0, len + 4);
        //            /////执行其他代码，对数据进行处理。
        //        }
        //        else //帧头不正确时，记得清除
        //        {
        //            buffer.RemoveAt(0);
        //        }
        //    }
        //}

        #region  CRC校验
        private static readonly byte[] aucCRCHi = {
             0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
             0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
             0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
             0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
             0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
             0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
             0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
             0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
             0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
             0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
             0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
             0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
             0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
             0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
             0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
             0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
             0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
             0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
             0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
             0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
             0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
             0x00, 0xC1, 0x81, 0x40
         };
        private static readonly byte[] aucCRCLo = {
             0x00, 0xC0, 0xC1, 0x01, 0xC3, 0x03, 0x02, 0xC2, 0xC6, 0x06, 0x07, 0xC7,
             0x05, 0xC5, 0xC4, 0x04, 0xCC, 0x0C, 0x0D, 0xCD, 0x0F, 0xCF, 0xCE, 0x0E,
             0x0A, 0xCA, 0xCB, 0x0B, 0xC9, 0x09, 0x08, 0xC8, 0xD8, 0x18, 0x19, 0xD9,
             0x1B, 0xDB, 0xDA, 0x1A, 0x1E, 0xDE, 0xDF, 0x1F, 0xDD, 0x1D, 0x1C, 0xDC,
             0x14, 0xD4, 0xD5, 0x15, 0xD7, 0x17, 0x16, 0xD6, 0xD2, 0x12, 0x13, 0xD3,
             0x11, 0xD1, 0xD0, 0x10, 0xF0, 0x30, 0x31, 0xF1, 0x33, 0xF3, 0xF2, 0x32,
             0x36, 0xF6, 0xF7, 0x37, 0xF5, 0x35, 0x34, 0xF4, 0x3C, 0xFC, 0xFD, 0x3D,
             0xFF, 0x3F, 0x3E, 0xFE, 0xFA, 0x3A, 0x3B, 0xFB, 0x39, 0xF9, 0xF8, 0x38,
             0x28, 0xE8, 0xE9, 0x29, 0xEB, 0x2B, 0x2A, 0xEA, 0xEE, 0x2E, 0x2F, 0xEF,
             0x2D, 0xED, 0xEC, 0x2C, 0xE4, 0x24, 0x25, 0xE5, 0x27, 0xE7, 0xE6, 0x26,
             0x22, 0xE2, 0xE3, 0x23, 0xE1, 0x21, 0x20, 0xE0, 0xA0, 0x60, 0x61, 0xA1,
             0x63, 0xA3, 0xA2, 0x62, 0x66, 0xA6, 0xA7, 0x67, 0xA5, 0x65, 0x64, 0xA4,
             0x6C, 0xAC, 0xAD, 0x6D, 0xAF, 0x6F, 0x6E, 0xAE, 0xAA, 0x6A, 0x6B, 0xAB,
             0x69, 0xA9, 0xA8, 0x68, 0x78, 0xB8, 0xB9, 0x79, 0xBB, 0x7B, 0x7A, 0xBA,
             0xBE, 0x7E, 0x7F, 0xBF, 0x7D, 0xBD, 0xBC, 0x7C, 0xB4, 0x74, 0x75, 0xB5,
             0x77, 0xB7, 0xB6, 0x76, 0x72, 0xB2, 0xB3, 0x73, 0xB1, 0x71, 0x70, 0xB0,
             0x50, 0x90, 0x91, 0x51, 0x93, 0x53, 0x52, 0x92, 0x96, 0x56, 0x57, 0x97,
             0x55, 0x95, 0x94, 0x54, 0x9C, 0x5C, 0x5D, 0x9D, 0x5F, 0x9F, 0x9E, 0x5E,
             0x5A, 0x9A, 0x9B, 0x5B, 0x99, 0x59, 0x58, 0x98, 0x88, 0x48, 0x49, 0x89,
             0x4B, 0x8B, 0x8A, 0x4A, 0x4E, 0x8E, 0x8F, 0x4F, 0x8D, 0x4D, 0x4C, 0x8C,
             0x44, 0x84, 0x85, 0x45, 0x87, 0x47, 0x46, 0x86, 0x82, 0x42, 0x43, 0x83,
             0x41, 0x81, 0x80, 0x40
         };
        private byte[] Crc16(byte[] pucFrame, int usLen)
        {
            int i = 0;
            byte crcHi = 0xFF;
            byte crcLo = 0xFF;
            UInt16 iIndex = 0x0000;

            while (usLen-- > 0)
            {
                iIndex = (UInt16)(crcLo ^ pucFrame[i++]);
                crcLo = (byte)(crcHi ^ aucCRCHi[iIndex]);
                crcHi = aucCRCLo[iIndex];
            }

            return new byte[] { crcLo, crcHi };
        }


        #endregion

        /// <summary>
        /// 累加和校验
        /// </summary>
        /// <param name="buffer">待校验字节数组</param>
        /// <returns>校验结果</returns>
        public byte CalculateSum(byte[] buffer)//取低八位
        {
            int cks = 0;
            foreach (byte item in buffer)
            {
                cks = (cks + item) % 0xffff;
            }
            //byte bt = (byte)((cks & 0xff00) >> 8);//取校验和高8位
            byte bt = (byte)(cks & 0xff);//取校验和低8位
            return bt;
        }
    }
}
